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Re: P0171B Fuel Trim system lean
Posted to Technical Discussion Forum on 8/28/2006

Jeff,

The O2 sensor was most likely o.k. Fuel Trim codes are raraly caused by o2 sensor failures. The o2 sensor monitor is much more efficient at catching o2 sensor faults that the fuel trim monitor.

I would check your freeze frame data to determine the op... Login to read more.